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Perfluoroelastomeric compositions

A technology of perfluoroelastomer and perfluoropolymer, which is applied in the field of perfluoroelastomer composition, can solve the problem that ion curing method cannot be used for curing and the like

Active Publication Date: 2010-06-16
SOLVAY SOLEXIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In addition, it is known that perfluoroelastomers with high fluorine content cannot be cured by ion curing methods because they usually do not contain VDF units in their main chain

Method used

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  • Perfluoroelastomeric compositions
  • Perfluoroelastomeric compositions
  • Perfluoroelastomeric compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] Polymerization

[0112] In a 22 liter steel autoclave equipped with a stirrer at 460 rpm, 14.5 liters of demineralized water and 145 ml of microemulsion obtained by mixing the following compounds were added after evacuation:

[0113] - 32 ml perfluoropolyoxyalkylene, average molecular weight 600, with acid end groups, the formula:

[0114] CF 2 ClO(CF 2 -CF(CF 3 )O) n (CF 2 O) m CF 2 COOH

[0115] where n / m=10;

[0116] -32ml NH 3 Aqueous solution, 30% by volume;

[0117] - 62 ml of demineralized water;

[0118] -19ml D02, average molecular weight 450, its formula:

[0119] CF 3 O(CF 2 -CF(CF 3 )O) n (CF 2 O) m CF 3

[0120] where n / m=20.

[0121] The autoclave was then heated to 80°C and maintained at said temperature throughout the reaction. Then add 35 grams of 1,4-diiodoperfluorobutane (C 4 f 8 I 2 ).

[0122] A monomer mixture having the following molar composition was then added:

[0123] - Tetrafluoroethylene (TFE) 35%;

[0124] - Pe...

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Abstract

A crosslinking system of perfuoroelastomers curable by peroxidic way comprising: as crosslinking agent, a bis-olefin having general formula: wherein: R1, R2, R3, R4, R5, R6, equal to or different fromeach other, are H or C1 -C5 alkyls; Z is a C1 -C18 linear or branched alkylene or cycloalkylene radical, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylene radical; the bis-olefin amount, expressed in per cent by weight on the total of polymer, being from 0.6% to 1.8%; peroxides for the peroxidic curing, capable to generate radicals by heating, in an amount from 0.2% to 1.3% by weight on the polymer.

Description

technical field [0001] The present invention relates to perfluoroelastomer compositions having improved heat resistance at elevated temperatures, even up to 350°C, preferably up to 340°C. Background technique [0002] Perfluoroelastomers are known to be cured by ionization or by using peroxides. During ionic curing, a suitable curing agent is added to the perfluoroelastomer together with an accelerator such as a hydroxylated compound like bisphenol AF and an accelerator such as a tetraalkylammonium salt , phosphonium or aminophosphonium salts. During peroxide cure, the polymer should contain cure sites capable of forming radicals in the presence of peroxide. For this reason, curing site monomers containing iodine and / or bromine are added to such chains during polymerization, as described in patents US 4 035 565, US 4 745 165 and EP 199 138, or alternatively , or simultaneously with the indicated systems, chain transfer agents containing iodine and / or bromine can be used t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/12C08J3/24C08K5/14C08F14/18C08K5/00C08K5/02
CPCC08K5/02C08K5/0025C08K5/14C08F14/18C08F2/02C08L27/12C08F14/20
Inventor G·科米诺M·阿尔巴诺M·阿波斯托洛
Owner SOLVAY SOLEXIS